200° 9 inches. 



J 90° 9-5 ... 



150° 12 



50° 36 



40° 45 



33-5° 53'4G ... 



484' Mr. Smee on the Cause of the Reduction of Metals 



accurate substitute for chemical analysis, although it may be 

 useful as a rough mode of appreciating the purity of an oil 

 or the strength of a solution of sugar. 



I subjoin a table of the results of some experiments, and 

 shall have great pleasure in examining any other samples that 

 may be sent or brought to me at the Laboratory at St. Tho- 

 mas's Hospital. 



Table of some rotating Liquids. 

 Right-handed. 



Depth 10 inches. 180° rotation. 

 Essential oil of caraway 



dill . . 



lemon . 

 Rectified oil of turpentine 

 Common oil of turpentine 

 Essential oil of nutmeg . 

 Solution of 1734 grs. cam- 

 phor in 2105 grs. alcohol 52° 34-5 ... 

 Solutions of cane-sugar in cold distilled water : 



Equal weights, sp.gr. 1-2371 104° 17-307... 



1 sugar to 2 water 1-1473 70° 25*7 ... 



1 sugar to 3 water 1'107 50° 36-0 ... 



Left-handed. 



Depth 10 inches. 180° rotation. 

 Essential oil of cubebs . . 83° 21-8 inches. 

 lavender . 20° 90 



Table of Essential Oils examined and possessing no rotating 



energy. 

 Essential oil of anise. 

 ... ... cloves. 



... ... pimento. 



chamomile, 

 calamus. 



LXXIII. On the Cause of the Reduction of Metals when solu- 

 tions of their salts are siibjected to the Galvanic Current. 

 By Alfred Smee, Esq., F.R.S., Surgeon to the Bank of 

 England, S^c.^' 



1. AT the present time, when the new science of electro- 

 -^^ metallurgy is improving and multiplying the arts of 



this already extensive manufacturing empire, there cannot be 



a subject more fit for the consideration of the Fellows of the 



* Communicated l)y the Author; having been read before tiie Roy^il 

 Society, March 9, 1843, as recorded in Phil. Mag. S. 3. vol. xxiii. p. ^\- 



